Adobe just announced on its blog that Photoshop CS6 would recieve a Retina update this fall:

The Photoshop and Lightroom teams are pleased to announce we will provide support for HiDPI displays in the coming months, including the Retina Display available on the new MacBook Pro. Supporting this new technology requires significant work by our product teams and we’re committed to provided a free update to all Photoshop CS6 customers this Fall and Lightroom 4 as soon as the work is complete. Please note that Creative Cloud members will receive Photoshop updates more frequently and receive this update in advance of updates for non-members. While Photoshop,Photoshop Touch and Lightroom will be joining Adobe Ideas in their support of HiDPI Retina Displays, Photoshop Elements will not fully support HiDPI displays in the immediate future however the team is investigating the effort required to support these new displays.

We are also hard at work on some new features that will be rolling out to Creative Cloud members in the coming months. Stay tuned for more details.

For additional background and information on other Adobe software products, please read this blog post.

Thanks for your patience as we work to ensure the quality of our products meet your expectations.